Web controller



T. M. AVERY WEB. CONTROLLER Fixed July 22. 192:

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UNITED STATES- PATENT OFFICE.

race at. AVERY, or GLENS FALLS, new Yonx, assrenon T UNION BAG a1 rarer.

oo nromrrou, or new YORK, N? Y., A CORPORATION or NEW YORK.

WEB CONTROLLER.-

Application filed July 22,

To allwhom it may concern:

Be 1t known that I, TRUE M. Avnnr, a

' citizen of the United States, residing at Glens Falls, in the county of lVarren and State of New York, have invented new and useful Improvements in Veb Controllers, of which the following is a specification.

The present invention relates to improvements in web-controlling mechanism of the same general class as that shown and described in my prior Patent No. 1,256,286, granted February 12, 1918. The primary object of this invention is to provide an improved web-controlling mechanism whereby greater sensitiveness of control and, in consequence, greater precision are attained in the maintenance of correct registration between a longitudinally-moving web and a device or mechanism which cooperates with or operates on the web at points or within areas which are spaced. in predetermined relation longitudinally of the web.

The invention is-adapted for use generally in all situations where it is desirable or necessary to maintain correct registration between a travelling web and a device or mechanism which operates thereon or cooperates therewith in the manner above stated. For example, it may be employed in or as a part of a paper bag making machine for the purpose of maintaining correct registration between the continuous travelling web of paper from which .the bags are to be produced and which bears printed advertisements or other impressions which are to appear on the completed bags, and the slitting, cutting or other device or devices in the machine which perform certain operations on the web in predetermined relation with the longitudinally-spaced imprints thereon; it may be employed in or as a part of a machine for cutting wall paper borders, for the purpose of maintaining accurate registration between the travelling web of printed wall paper border and the border trimming cutters; or it may be used in the printing art to secure accurate registration between successive imprints where, as for instance, in color printing, the printed matter is produced by a plurality of successive impressions. Other uses for the invention will suggest themselves and theseare contemplated and will be included within the scope of the claims.

9 a vertical section 1921. Serial NO. 486,741.

In the accompanying drawiiigs Figure 1 is-a side elevation of a paper bag making machine equipped with a web controller constructed in accordance with the present invention;

Figure 2 represents, on an enlarged scale,

on the line 2-2 of, Figure 1;

Figure 3 represents a' section on the line 33 of Figure 2, looking in the direction of the arrows;

Figure 4: represents a section on the line 4-4 of Figure 2, looking downwardly;

Figure 4 is a top plan view of a portion of'the machine showing the breaker or web cut-off device and part of the driving connection between it and the web controller;

Figure 5 represents a section on the line 55 of Figure 2, looking downwardly;

detector of the Figure 6 is a detail view of the detector 4 which forms part of the. web controller; Figure 7 is a detail view partly in section, of the web-controlled member of the detector;

Figure 8 is a detail view of one of the .collector rings and its cooperative brush forming part of the electrical mechanism of the controller;

- Figure 9 represents, on an enlarged scale, a longitudinal section through the detector; F igure, 10 represents a transverse section through the web-controlled member shown iri-Figure 7, the'sectio'n being taken on the line 1010 of Figure 9;

Figure 11 represents a section on the line 1111 of Figure 9;

Figure 12 represents a longitudinal sec tion through the electrical elements of the detector on 'a different plane from that shown in Figure 9;

Figure 13 is a detail perspective view of the regulating contact of the controller; and Figure 14 is a diagrammatic view showing the preferred electrical connections of the controller. Similar parts are designatedby the same reference characters in the several views.

Web-controlling mechanism embodying the present invention is applicable generally to all situations where it is desirable or nec-' essary to maintain correct registration between a; travelling web of paper or other a material, and a device or mechanism which operates on. or cooperates with the web in predetermined relation to the length of the web. The invention enables the travelling to be so controlled, while it continues to travel, that great accuracy or precision may besecured in the registration of the web with the device or mechanism which is designedand intended to register with it. This result is accomplished, according to the present invention, by a detector, one element of which operates in invariable timed relation with the device or mechanism which is designed or intended to register with the web, and another element of which ope ates in accordance with the actual movements of the web, devices being provided as a part of the detector which respond immediately to any variation in the speed of the web which would tend to destroy or impair registration. A compensating drive of novel and improved construction serves to advance the web and this compensating drive is con trolled by the detector in such a way that the speed of the travelling web is increased or decreased as conditions may require, in order to maintain correct registration be tween the travelling web and the device or mechanismwhich cooperates with it. The detector and compensating-drive are so constructed and related that they'a-re very sensitive to variations in the relation between the travelling web and the device or-mechanism which is designed to register.with it and they are capable of responding im: mediatly to increase or decrease the speed of the web and to thus maintain registration within very close limits.

The invention .in the present instance is shown applied to a paper bag makingmachine for the purpose of maintaining correctregistration between the continuous travelling web of paper and the slitters. breaker o'rother parts of the machine which are intended to and should register very closely with the web at predetermined intervals in its length during its passage through the machine, such an application of the invention being typical of other uses to which the invention may be applied.

In this instance, the machine comprises generally a. main frame 1 containing side memlwrs to support the operating mechanisms of the machine, such as printing rolls 2 adapted to imprint advertisements or other printed matter at predetermined intervals in the length of the web or strip of paperwhich is usually in the form of a tube, a gum-applying mechanism 3 adapted to apply adhesive to the web, slitters 4 adapted to operate on the web at predetermined intcrvals in its length and in definite relation to the imprints on the web, to-form tabs or flapcwhich serve to secure the'bottoms of the completed bags, a pair of draw rolls about midway between the draw rolls and pinch I rolls to completely sever the strip or web into bag lengths at points in definite relation with the printed impressions, and folding and cooperative bag forming mechanism 7, the construction and opera tion of which is well understood in the art, and hencerequires no detailed description. A rack 8 may be provided at one end of the machine to support airoll of paper 9 on an arbor or shaft 10, so that the paper in the form of a continuous strip or web is -fed into the receiving end of the machine at a rate determined by the speed of the draw rolls 5.

The: draw rolls 5, a pair of which may be used,. as is shown.' are nrountcd on shafts 11 and 12, these shafts being connected by suitable gearing 13 to insure rotation of the two draw rolls at equal speed, the draw rolls gripping the web between'them and thus insuring advance of the web at a speed which will be determined by the speed of the draw rolls. One of the draw roll shaft-s, the lower shaft 11 in the present instance, is connected to the main drive shaft 14, through the medium of a compensator which, according to the present invention, is capable of increasing or diminishing the speed of the draw rolls and, in consequence, the speed of the web, under control of the detector, to compensate immediately for any slight variations which may occur between the imprints on the web and the slitters 4, or any equivalent device to be registered with the web. In the present instance, the main shaft 14; is provided with a gear which meshes with anddriv'es an intermediate gear 16. This gear-16 in turndrives the )inch rolls 6 through an intermediate gear 1 and any suitable gearing connecting the latter to one of the pinch roller shafts, and this intermediate gear 17 also drives a gear 18 which forms part of the compensating drive for the draw rolls. The gear 16 also drives the slitters 4,. through the medium of the gears 19 and 20, and the breaker 6 is driven from and at equal speed with the pinch rolls by suitable gears 6". By this arrangen'lcnt. the slit-tors, breaker and the pinch rolls will be driven at a definite speed in relation to the Speed of the main .drive shaft 14, but-the draw rolls 5 are driven through a compensator whichenables the draw rolls to be driven at a variable s eed. The compensator comprises pieferab v a ditferential transmission which is driven from the main shaft at a speed in definiterelation to the speed of the main shaft, but which is capable of transmitting motion to the draw rolls at an increasing and decreasing ratio. As SllO\\'l1.\

internal gear face 22 with which a suitable number ofpinions 23 cooperate, two pinions being preferred and shown in the present instance. The shafts or studs 24 on which the pinions are journallcd are fixed to a worm wheel 25, this worm wheel being journalled on the shaft 11 and itself journalled in abearing 26 which forms part of a gear housing 27 which latter is bolted or. otherwise fixed to the adjacentside member of the main frame. The pinions 23 cooperate at the inner sides of their shafts 24 with a spur gear 28 which is keyed or otherwise fixed to the draw roll shaft 11.

In the construction as thus far described,

motion will be transmitted from the gear 18' throu h the member 21 to the pinions 23 and t 1e pinionsin turn will drive the draw roll shaft 11' through the spur gear 28. If

the worm wheel 25 which supports the journals of the, pinions 23 is held stationary, the ratio of speed transmission between the mainshaft '14 and the draw rolls would be constant, whereas, if the worm! wheel 25 were rotatedin either directionabout the shaft 11, while the drive is taking place through the differential, the ratio of transmission between the main drive shaft 14 and the draw rolls will be increased or decreased according to the direction 7 in which the worm wheel is rotated. The present invention provides relativcly'simple and efficient means for rotating the worm wheel 25 to vary the ratio of speed transmission through the differential mechanism and to thus compensate for any influences tending to destroyer impair correct registration between the travelling web and the slitters, breaker or other mechanism of the machinewhich depends upon registration with the web for the proper performance of its function. This com;- pensat-ing means, as shown, comprises a worm 29 which is fixed on a shaft 30, the upper end of this shaft being suitably journalled in the upper end of a bracket, which latter may form part of the gear housing 27. The lower end of the shaft 30 has a worm wheel 31 fixed thereon. and this worm wheel meshes with a worm 32 fixed on a shaft The shaft- 33 may be conveniently j ournalled in a bracket 34 bolted or otherwise fixed to the main frame and this shaft is driven by a reversible motor 35, a reversible electric motor being preferably used. Obviously, when the electric motor is running in one direction, it will cause the worm wheel25 to revolve in a corresponding direction whicln,

for example, may increase the ratio of speed transmission through the differential mechanism and consequently speed up the draw rolls to accelerate the travel of the web through the machine, whereas, while the motor is revolving in a reverse direction, the worm wheel 25 will be revolved in a direction ()Pl'KlSltfllO that above described and,

in consequence, the ratio of speed transmission through the differential device will, for example, be reduced, in consequence of which the draw rolls will operate at a relatively lower speed and the. movement of the web through the machine will be thus retarded.

The present invention provides a relatively simple and efiicient device for detectpig within very close limits any lack of registration that may develop between the travelling web and the slitters, breaker or any-other mechanism of the machine which depends upon such registration for the proper performance of its function. Preferably and as shown in Figures 5 to 14 inclusive. this detector comprises a shaft 36 which is journallcd in suitable hearings on the main frame and a roll 37 over which the travelling web passes and which runs tween the detector and the paper roll to secure the necessary lap of theweb around the detector roll when such is necessary. The detector shaft carries a slce've 39 which may becomposed of metal and provided to the shaft and to maintain a definite relation to the shaft during its operation. One end of thissleeveis formed with a shoulder 41 on which is fitted a cylindrical ball race 42. A ball cage or spacing ring 43 encircles the ball race 42 and contains sets I of balls 44 and the bearing thus formed supports a member of the detector which is driven by and in exact accordance with the speed of the travelling web. In the present instance. this member is in the form of a toothed ring or sprocket; 45 which is mounted on the series of balls 44 which encircle the ball race 42, the ring being thus supported for rotation relatively to the ball race 42 with a minimum resistance. and a driving connection is established between this ring andthe travelling web, preferably through the equidistantly-spaced circumferentially-extending teeth or projections 46 which register with and engage in a series of correspondingly spaced perforations extending longitudinally of theweb. These.

perforations in the web may be previously formed or they may be formed in the web at any time prior to its passage over the 7 with'a set screw'40 by which it"niay beffixed 'i bushings may be advantageously made of a suitable hard wood and they are nonrotatably fixed. to the sleeve 39 by a key 51; The adjacent faces of the bushings are formed with complemental grooves or recesses extending circumferentially thereof and these grooves or recesses formed between the bushings 4:7 and 48 receive a pair dercuts are secured by the screws 58 or.

otherwise to the ends of the contact members 52 and these.end-piecesbemg thus adapted to retain the contact members 52 and 53 within the groove between the bushings, but permitting relative circumferential movement between these members to adjust the,- gap54 between them and within which the contact operates. The adjacent ends of the bushings 48 and 49 are similarly grooved or recessed to receive a continuous metal collector ring 59 and the adjacent ends of the bushings 49 and 50 are also grooved or recessed to receive'a second continuous metallic collector ring 60.

Dowell pins 61 may be fitted between these to insure rotation of the rings with the bushings, and the bushings, collector rings and the contact members 52 and 53 are all clamped firmly together preferably by a collar 62 which is threaded on the end of the sleeve 39 opposite to the shoulder 41 and which acts to clamp the elements mentioned between it and the shoulder 41. The ball race 42 is held in place between the bushing 47 and a flange 63, the latter being secured to the end of the sleeve 39 adjacent to the roll 37 and held in place by screws 64' or by other suitable means. The contact 55 which occupies a position in the gap 54 between the contact members 52 and 53 is mounted preferably on a rocker 65, whereby the contact n'iay oscillate to a suitable degree and this rocker is pivoted on a. shaft 66 supported on an arm 67 which latter is fixed to the ring or sprocket 45, The contact and its rocker are preferably retained normally in a medial position, a spring 68 being provided for this purpose in the present instance, the intermediate portion of the spring being coiled about a pin 69 fixed to the arm 67 while the two arm 70 and 71 of the spring straddle the rocker shaft 66 and bear on opimsitesides of a pin 72 carried by the rocker. By this arrangement, the two arms of the spring which have a tendency to approach one ancollector rings and the respective bushin s other will normally bear against the .opposite sides of the rocker shaft 66 and will be thus positioned 'to hold the rocker in a medial position, although the rocker may yield against the action of one or the other of the spring arms when engagement occurs between the contact and one of the contact members 52 or 53. This mode of mounting the controlling contact 55 is generally preferred, as it not only avoids impactor shock when it engagesone of the contact members, but this arrangen'ientenables the contact to be completed and to thus set the compensating drive into operation to restore correct registration of' the web in the machine, without obstructing or interfering withthe relative rotation that occurs between the ring or sprocket 45 and the detector shaft and the degree ,of wluch wlll depend upon the amountof variance bewithin the machine which are to be maintained in registration therewith;

The detector shaft 36, together with the contact members and 55-3 and the collector rings 59 and 60 are driven in definite and constant timed relation with the slitters a and the breaker 6* or an Y other part of the machine which is tobe maintained in registration with the web. Any suitable gearing may be employed for this purpose,

the gearing shown in the present instance comprising a longitudinal shaft- 73 connected by equal-size bevel gears 7 4: to the shaft of the breaker, this shaft in turn driving, through equal-size bevel gears 75, a cross shaft 175 and a train of spur gears 176 leading to agear 177. This gear 177 in turn meshes with a gear or pinion 76 on' the detector roll shaft 36. During the.

operation of the machine, this driving connection between the slitters, the breaker or i tween the web and the .device or devices an equivalent device and the detector roll shaft transmits motion to the latter at an invariable ratio to cause one revolution of.

the detector roll each time a bag length is cutofi' from the web by the breaker, but

it may be necessary or desirable, preparatory to the starting ofthe machine, to'permit the detector shaft 36 to be set manually to bring it into properly timed relation to the slibters, breaker, or other mechanism to be registered with the web. For this purpose, it is preferable to fit the driving gear or pinion 76 loosely on the detector roll shaft 36 and to couple it to said shaft by an appropriate clutch. For instance, as shown, one face of the gear 76 may be formed with a conical clutch face 77 to receive a complemcntal clutch meurlmr 78, the latter being splined on the detur tor roll shaft, through the key 79. and provided conveniently with a hand-wheel 80 which enables the detector roll shaft tobe rotated manually to set it while the clutch is disto a part of the frame of the machine. The

contact members 52 and 53 are connected respectively to the collector rings 59 and 60. Preferably and as shown in Figures 11 and 12, a pair of conducting pins 87 and 88 are fitted in a bore 89 formed in the bushing 48, and a compression spring 90 acts between these pins to force and hold them in contact with one of the contact members, the contact member 52 in the present instance. A simi-' lar conducting pin 91 is fitted in a bore 92 in the bushing 48 and bears against the other contact member 53 and this bore contains a compressed spring 93 which acts on a second conducting pin 94, the latter extending through an insulating bushing 95 in the col lector ring 59 and making contact with the collector ring 60.

Suitable electrical connections are provided whereby the compensating motor will be driven in a forward or reverse direction by the engagement of the controlling contact- 55,with one or the other of the contact members or 53. Preferably, a local battery circuit is provided for the controlling contacts of the detector, such a circuit being shown in Figure 14, wherein B represents a battery of suitable voltage, S represents a switch which may be provided to open the detector circuit when the machine is not in use, or when the machine is operated under conditions which do not require the use of the detector, as, for example, when plain paper is being run through the machine. The controlling contact carried by the toothed ring or sprocket may, as shown, be grounded on the machine and accordingly one terminal of the local battery circuit will be grounded on the machine.

' Preferably, the te'rnrinal of the local circuit which is to be grounded is connected to a contact 95 which is insulated from the machine but is to be connected to ground on the machine by a contact blade 96 which may be carried on the starting or controlling shaft 97 through which. the macl'iine is started and stopped, so that the detector will be thrown in and out of operation automatically, coincident with the starting and stopping of the machine. A relay R is preferably provided by which the local circuit of the detector may control the line or power circuit for the compensating motor 35 and this relay is capable of so controlling the line or power circuit as to cause the compensating a pair of electro-magnets 98 and 99 and :1

ed to the line wire 111 of the motor circuit motor to run in a forward or reverse direction, according to the correction for re iscration which is to be made .under contro of the detector. As shown, the relay comprises 7 0 pair of cooperating armatures 100 and 101, these armatures being carried by spring contact blades 102 and 103 which are fixed at one end to a support 10 and carry contact points 105 and 106 at their opposite or free ends, to cooperate with corresponding c011- tact points on the terminals 107 and 108 for the motor control wires 109 and 110 respec tively, the blades 102 and 103 being connectthrough preferably a fuse-block 112 and conductors 113. The other line wire 114 for the motor circuit is connected to a third terminal on the motor 35, it being understood that the motor shown diagrammatically in the'present instance is of the type which will run in one direction when current is supplied thereto through the line wire 114 and the wire 109 and it will run in a reverse direction when current is supplied to it through the line wire 114 and the wire 110. The battery B of the local circuit is connected through the conductor 115 to both of the electro-magnets 98 and 99 and one of these electro-magnets, as, for example, the electromagnet 98, is connected by the conductor 116 to the brush 83 which engages the collector ring'GO, while the other electro-magnet 99 is connected by the conductor 117-to the brush 82 which engages the collector ring 59.

The mode of operation of a bag making machine embodying a web controller as hereinbefore described, is briefly as follows: The strip of paper from the paper roll 9'is threaded through the different mechanisms of the machine, it passing over the detector roll, between the slitters, between the draw rolls and between the pinch rolls and thence through the mechanisms which fold, out and complete the bags in a manner well understood in the art. Usually in operating upon the web with the slitters, breaker, pinch I rolls and bag folding and completing mechv anisms, the strip of paper is of continuous length and usually of tubular form and has been previously printed with advertisements or other printed matter which it is desired should appear in uniform positions on the completed bags, the imprints on thestrip being spaced at redetermined intervals longitudinally of tilie strip, as an incident to the printing thereof. Obviously, the slitting, cutting-ofl, and other operations performed on the strip to form bags therefrom must be formed in fixed or definite relation to the printed impressions on the strip; that is .to say, these operations must be performed in registration with the printed impressions on .the strip, in order to.insure uniformity in the location of the printed impressions on the finished bags. The strip or web is drawn continuously through the machine by the draw rolls 5 and during the advance of the strip or web, the slitters 4, brehker or cut-ofi 6, and pinch rolls 6 operate thereon. Experience has demonstrated that uniformity in the speed of the strip or web and the maintenance of registration between it and the mechanisms of the machine which should register with the strip can not be secured by the mere drawing of the strip or vweb through the machine by draw rolls which operate at a constant speed or at a speed in fixed ratio to the speed of the mechanisms which are required to register with the strip, owing to slippage between the smooth faces of the draw rolls and the strip. According to the present invention, however, the slitters 4, breaker 6 and pinch rolls (3, when such are used, are driven at a fixed speed ratio relatively to the speed of the main drive shaft 14, but the draw rolls 5 are driven through a differential mechanism which is capable of varying the ratio of speed transmission, in conjunction with a motor which is capable of acting on the differential to increase or diminish the speed of the draw rolls; In the particular construction shown, it will be understood that if the worm wheel 25 remains stationary, the pinions 23 of the difierentia-l gearing will transmit motion to the draw rolls at a fixed ratio, but if the motor 35 runs in onedirection, the worm wheel 25 will be revolved in a direction to alter the ratio of speed transmission and thus increase the speed of the draw rolls and if the motor runs in a reverse direction, the worm wheel 25 will be revolved in'a direction to alter the ratio of speed transmission in a manner to reduce the speed of the draw rolls. The draw rolls constantly grip the strip or web and any variances which occur in the speed of the draw rolls will produce a corresponding variation in the speed of the web. WVorking in conjunction with the speed compensator just described is the detector over which the web passes. The shaft 36 of the detector is-driven, through the gearing previously described, at a fixed ratio or in definite timed relation to the slitters 4, breaker or cut-off 6* and also the pinch rolls 6 when the latter are used, and hence the contact members 52 will be caused to revolve in proper timed relation to the slitters and breaker. An edge of the strip or web,

which is provided with regularly spaced perforations, overlaps the contact controlling ring or member 45 which is very freely ro tat-able relatively to, the detector shaft, and in order to cause rotation of this ring in exact accordance with the actual speed of the strip or web, this ring is provided with teeth or projections which engage in the perforations in the web. By this arrangement, it will be understood that the contact members 52 and 53 are revolving in definite timed relation to the slitters, while the contact controlling ring 45 is revolving in accordance with the actual speed of the web. When the web is moving at a speed which will insure correct registration between the printed impressions thereon and the sitters, breaker or equivalent mechanism in the machine, the contact 55 on the ring 45 will occupy a. medial position in the gap 54 between the contact members 52 and 53, the contact 55 being then out of engagement with both of these contact members, in consequence of which the local circuit supplied with current from the battery B willbe open. The con'lpensating mm or 35 will then be at rest, the worm wheel 25 ill be motionless and the ratio of speed transmission between the main drive shaft 14 and the draw rolls 5 will be constant. However, in the operation of machines of this class, the rate of movement of the strip or web varies, it accelerating and retarding, owing to variations in the grip of the draw rolls on the web, and it is the purpose of the present invention to prevent such variation to an extent that Would cause an appreciable variation in the registration between the web and the slitters, breaker or other mechan sm of the machine This result is accomplished by the detector operating in conjunction with the compensating motor. Should the speed of the web drop slightly, the contactcarrying ring 45 which is driven by or in exact accordance with the speed of the web, will lag slightly relatively to the detector shaft 36 and this will bring the contact 55 on this contact ring into engagement with the adjacent end of the contact member 53. The engagement of these contacts closes the local circuit through the electroanagnet 98, in consequence of which such magnet is energized and the contact 105 engages the terminal 107 and thus completes the line circuit from the conductor 111 through the motor, in a manner to drive the motor 35 in a forward direction, and this motor operating through the worm gearing previously described causes the worm wheel 25 to revolve in .a direction to vary the ratio of speed transmission in a manner to increase the speed of the draw rolls As a result, the speed of the web will be increased to bring the printed impressions thereon into correct registration with the slitters, breaker or equivalent mechanism. On the other hand, should the speed of the web increase. the ring 45 which isdriven by or in exact ac.- cordance with the speed of the web, will be carried into an advanced position of rotation relatively to the detector shaft which. as previously explained, is driven in fixed timed relation with the slitters, breaker or equivalent mechanism, This action will Ill strip or web of carry the. contact 55 forward into engagement with the contact member .52 which revolves in unison with the detector shaft. As a consequence, the local circuit will bd closed through the electro-magnet 99 and energizing of this magnet will close the motor line circuit through the contact 106, terminal 108 and conductor 109, thus causing the motor 35- to revolve in a reverse direction. The motor operating through the worm gearing will then revolve the worm wheel 25 in a direction to alter the ratio of speed trans-' mission in a manner to diminish the speed of the draw rolls 5, in consequence of'which the speed of the stri or web will be reduced.

In each instance, t e compensating action of themotor 35 continues until the controlling contact 55 has returned to its medial position, thus opening the local circuit and interrupting the operation of the compensating motor. However, the detector is very sensitive to variations in the speed of the strip or web relatively to the mechanism to which the detector is timed and also the compensating motor corresponds immediately to correct the speed of the web under control of the detector.

In operating the machine shown in the present instance for the purpose of slitting,

cutting off and forming paperbags from a paper having imprints at intervals in its length, the strip or web is usually printed on a suitable printing machine and perforations along one edge thereof for the engagement of the sprocket teeth of the controlling contact are preferably made coincident with the printing operation. The subsequent passage of this printed and perforated strip through the machine employing slitters, breakers or other devices I which should register their operations with the printed impressions on the strip will insure correct registration in this respect through the operation of the detector and the cooperative compensating motor.

lVeb-controlling means embodying the present invention insures registration with in very close limits between a travelling web and a device to operate therein at predetermined intervals. -The detector provided is very sensitive to any variation in speed between the travelling web and the speed of the device which operates thereon, and the reversible motor responds immediately, under the control of the detector, .to correct any speed variation that may occur. It is particularly advantageous to employ a reversible electric motor to efi'ectcompensating for any speed variation, not only because of the facility of installation of the motor, but also because the motor may re-'- main coupled to the variable speed transmission meansand hence it will act without lost motion or delay upon the variable speedtransmission means" to promptly compensate for any speed variation that may occur, thus reducing the variation in registration to the m1n1mum.-

The application of a reversible electric motor to the variablespeed driving mechanism is substantially aided, and the compensating effect secured' is materially imthese parts with a relatively small number of gears, but the worms are capable of sustaining. the forces exerted upon them by their respective worm wheels, arising from the reaction referred to, and hence the com- ..pensating motor, when de-energized, will not be revolved under the influence of such reaction.

Obviously, the invention is capable of use in many instances where it is desirable or necessary to control the speed of a strip or web substantially as described. For example where printed matter is applied to-a strip or web by successive impressions as, for example, is done in color printing, the web controller can be used to maintain correct registration between the successive impressions. In such case, the detector shaft would be driven in timed relation to the printing mechanism and the controlling contact would be driven by or in'accordance with the actual speed of the web. Similarly, in machines for trimming wall paper borders, the web controller may be used. advantageously to maintain correct registration between theprinted border on the paper and the correspondingly shaped trimming cutters, in which case, the detector would be driven in'timed cutters and the controlling contact would be driven-by or in accordance with the actual speed of the web.

I claim as my invention 1. A web" controller comprising, in combination with web-advancing means, and a device operative on the web at predetermined intervals longitudinally thereof, a detector operative in response t variations in the speed pf the web relatively to the speed of operation of said device,

relation to the trimming 2. A web-controller comprising,'in combinatlon, with web-advancmg means, andadevice operative on the web at intervals in its length during its advance, a detector responsive to variations in the speed of the web in relation to the speed of operation of said device. variable speed driving means for the web-advancing means, and a reversible lnotor controlled by the detector and operative on the variable speed driving means to com-- pens-ate for variations in the speed of the web relatively tovthe speed of operation of said device.

3. A web-controller-'comprising, in combination, with web-advancing means, and a device, to operate at intervals on the web dur ing its travel. a detector responsive to variations in the speed of the web relatively to the speed of operation of said device, variable speed driving means for the web-advancing means, and a reversible'motor controlled by the detector and operative in response to variations in speed of the web to alter the ratio of speed transmission through said driving means to accelerate or retard the speed of the web relatively to'the speed of op eration of said device.

41. A web-controlling means, comprising,

in combination, with web-advancing means,

and a device to operate at intervalson the web during its travel, a speed-variation detector embodying cooperative electrical contacts timed in part in accordance with the speed of operation of said device and in part in accordancewith the actual speed of advance of the web, variable-speed driving means for the web-advancing means, and-a reversible electrical motor controlled in its operation and direction of rotation bythe. contacts of the detector and operative on said variable-speed driving means to increase or decrease the speed of the web-advancing means to bring the speed of the web into conformity with the speed of operation of said device.

A web-controller comprising, incom bination, with web-advancing means, and a device to operate at intervals on the web during its travel, a detector having cooperative' electrical contacts controlled in part in accordance with the speed of operation of said device and in part by the speed of the web, a local circuit including a relay controlled by the contacts of the detector, and means including a reversible electric motor capable of varying the speed of the webadvancing means, the operation and direction of rotation of the motor being con-.

trolled by the relay.

6. In combination with a web-controller comprising means for advancing a web, and a device adapted to register with and operate on the web, a detector for determining variations in speed between the web and the speed of operation of said device com- .tacts for altering the relation between them.

7. A speed-variation detector for web-f controllers comprising a support carrying a pair of opposed contacts, a controlling member adapted tobe drivenin accordance with the speed of the web, and a controlling contact carried by the controlling member and arranged toengage one or the other of said opposed contacts, the controlling contact being movable relatively to the controlling member under the influence of its engagement with one. of said opposed con-' tacts.

8. A speed-variation detector for web controllers comprising a pair of opposed 'contacts-revoluble in unison, and a controlling membcr rotatable relatively to said opposed contacts and carrying a controlling contact operative between and arranged to be engaged by one or the other of the opposed contacts, said' controlling contact being mounted to swing, relatively to the controlling member,- under the influence of its engagement with one or the other of the opposed contacts.

9. A speed-variation detector for webcontrollers comprising asupport carrying a pair of cirmnnferentially-spaced contacts which are rotatable in unison, a control ling member rotatable with and also relatively to said support, a controlling contact carried by said member and movable relatively to it in a circumferential direction, under the influence of the engagement with one or the other of said opposed contacts, and means for restoring said cont-rolling contact to a medial position after its deflection by one of the opposed contacts.

10. A speed-variation detector for webcontrollers comprising a rotatable support carrying a pair of opposed circumferentially-spaced abutments, a controlling member freely rotatable relatively to said support and carrying a controlling abutment which 'is located 111 the paths of said opposed abutments, one of said abutments being yieldable circumferentially under the influence of its engagement with another of said abutments in consequence of relative rotation between said member and support. I

11. A speed-variation detector for webcontrollers comprising a support adapted to be revolved in accordance with the speed of an element of a machine and carrying opposed circumferentially-spaced abutments, a controlling member adapted to be revolved in accordance with the speed of a web and carrying pivotally an abutment whichis arranged to be swung cireiimferentially relaiao arranged to engage one or tively to its carrying member under the influence of its engagement with either of the opposed abutments, and means for yieldingly holding said swinging abutment in a medial position.

12. A speed-variation detector for webcontrollers comprising a support having means for revolving it in accordance with the speed of operation of. an element of a web-handling machine and carrying a pair of circumferentially-spaced electrical contacts, a member freely rotatable relatively to said support and having means for revolv ing it in accordance with the speed of a web, a controlling electrical contact carried by said member and arranged to be engaged by either of said opposed contacts, said controlling contact being pivoted to swing relatively tos'aid member in the circumferential space between the opposed contacts, and means for holding the controlling contact in a medial position when not engaged by one of the opposed contacts.

13. A speed-variation detector for webcontrollers comprising a rotatable support, a pair of opposed justable relatively to one another in a direction circumferentially of the support, and a controlling member freely rotatable relatively to said support and carrying a controlling contact arranged to cooperate with one or the other of said opposed contacts in consequence of relative rotation between said member and support.

14. A speed-variation detector of the character described comprising a rotatable support formed with a circumferential groove, a pair of segmental contact members in said groove forming a circumferential gap between them, and a member rotatable relatively to said support and carrying a contact which operates in said gap.

15. A speed-variation detector of the character described comprising a support embodying relatively axially movable bushings, a pair of segmental contacts clamped in fixed relation between said bushings, and a controlling member freely rptatable relatively to said support and carrying a contact the other of said opposed contacts.

16. A detector of the character described comprising a plurality of bushings having contacts spaced and ad complemental grooves formed in their adjacent ends, a pair of collector-rings fitted respectively in the grooves between certain of said bushings, a pair of segmental contact members fittedin the grooves between others of said bushings, conducting members between the contact members and the respective collector rings, and means for compressing the bushings axially to clamp the collector rings and contact members in fixed relation vtherewith.

17 A detector of the character described comprising a roller carrying a pair of circumterentially spaced abutments, a toothed annular member carrying a controlling abutment which projects inwardly toward the center of said member and cooperates with said opposed abutments, and an anti-friction bearing supporting said member for rotation freely relatively to said roller.

18. A speed compensator for web-controllers comprising, in combination, a variable speed mechanism for driving web-advancing rolls, and a reversible motor connected to drive the speed controlling element of said mechanism in one direction or the other to increase or decrease the'speed at which the web-advancing rolls are driven.

19. A speed compensator of the character described comprising a variablespeed mechanism, a reversible electric motor, and gearing connecting said motor to a speed varying element of said mechanism to drive the same in one direction or the other to vary the ratio of speed transmission through said mechanism.

20. A speed compensator for web-controllers comprising, in combination, web-advancing rolls, a variable speed mechanism for driving said rolls, a reversible electric motor, and a system of worm gearing connecting said motor to a speed-varyin element of said mechanism to drive suc ele ment in one direction or the other to increase or decrease the speed of the web-advancing rolls.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

TRUE M. AVERY.

Witnesses M. P. KENN'EY, S. W. Lawrence. 

